/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.qlangtech.tis.plugin.datax;

import com.qlangtech.tis.datax.IDataxReader;
import com.qlangtech.tis.plugin.ds.CMeta;
import com.qlangtech.tis.plugin.ds.ColumnMetaData;

import java.util.List;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Stream;

/**
 * @author: 百岁（baisui@qlangtech.com）
 * @create: 2024-06-25 10:08
 * @see com.qlangtech.tis.plugin.datax.SelectedTab
 **/
public class ThreadCacheTableCols {
    private final Supplier<List<CMeta>> selectedColsSupplier;
    private List<CMeta> selectedCols;
    private final List<ColumnMetaData> selectableCols;
    public IDataxReader plugin;
    // private final Function<List<ColumnMetaData>, Stream<ColumnMetaData>> selectableColsStreamFunc;

    /**
     * @param selectedCols   已经选中的列
     * @param selectableCols
     */
    public ThreadCacheTableCols(IDataxReader plugin, Supplier<List<CMeta>> selectedCols, List<ColumnMetaData> selectableCols) {
        this.selectedColsSupplier = selectedCols;
        this.selectableCols = selectableCols;
        this.plugin = plugin;
    }

    public List<CMeta> getSelectedCols() {
        if (selectedCols == null) {
            selectedCols = selectedColsSupplier.get();
        }
        return selectedCols;
    }

    public Stream<ColumnMetaData> getStreamedSelectableCols(Function<List<ColumnMetaData>, Stream<ColumnMetaData>> selectableColsStreamFunc) {
        return selectableColsStreamFunc.apply(this.selectableCols);
    }
}
